milk data frame has 17 rows and 2 columns.
Each of 17 panelists compared two milk samples
This data frame contains the following columns:
a numeric vector consisting of the assessments for four units of additive
a numeric vector while the is the assessment for one unit of additive
print("Rug Plot - Example 1.8.1") xyrange <- range(milk) plot(four ~ one, data = milk, xlim = xyrange, ylim = xyrange, pch = 16) rug(milk$one) rug(milk$four, side = 2) abline(0, 1)